Filter bag



F. OLSON FILTER vBAG Dec. 3, 1929.

2 Sheets-Sheet 1 Filed Oct. 17. 1927 S e. I @L Dec@ 3, 1929.

F. OLSON FILTER BAG Filed ost.` 17. 1927 2 Sheets-Sheet 2 Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE FREDERICK OLSON, 0F CHICAGO, ILLINOIS FILTER BAG My invention relates to bags which are used in machines employed for filtering gasoline, naptha, varnish and other' fluids; that is to say, my invention pertains to bags of the 5 type employed as the filtering means in what is known as a pressure type of filtering machine, wherein the bags are suspended between vertically arranged screens of predetermined mesh.

The object of my invention is to provide a bag,-into which the fluid is introduced,- of suoli construction that all of the fluid, which is under pressure, will be made to percolate through the fabric and trickle or flow down on the adjacent screens.

Another object of my invention is to provide a bag of double capacity as it were; namely a bifurcated bag adapted to straddle an intervening screen, thus enabling a screen to be disposed adjacent to each side of each leg or bifurcation; with the juncture between the bifurcations or legs made so that ready access to the bag interior may be had for the purpose of properly cleaning the same.

The invention also involves means whereby the bag may be readily suspended in place and means whereby the juncture between the two legs or bifurcations may be completely sealed and firmly held in closed condition and passage of the fluid at the juncture prevented.

The objects and advantages of my inven tion will be readily comprehended from the detailed description of the accompanying drawings, wherein:

Figure 1 is a sectional elevation of a filtering machine with my improved bags shown in position; the bags being shown in side elevation. j

Figure 2 is a vertical section through one of the bags, with an intermediate portion broken away.

Figure 3 is a sectional detail view of the juncture or crotch yconstruction and its closure means.

Figure 4 is a cross sectional view of the upper part of the machine illustrated in Figure 1; the view being taken at right angles to Figure 1 and showing the upper end of a 9 ba in section.

Figure 5 is a perspective view of the upper end or top of my improved bag.

Figure 6 is a perspective view of a bag with portions broken away and one of the legs or bifurcations in raised position to illustrate the juncture or crotch closure means which is partly in place; the lower ends of both legs or bifurcations and a part of the top of the bag being broken away.

My improved bag is especially intended for use with filtering machines of the type described in my pending application Serial No. 176,371, which consist of an outer tank or shell 10, which is preferably cylindrical to withstand the usual pressure employed, and provided with an inner wall, or shell 11 maintained in spaced relation with the outer shell. rlhe inner shell may be formed as described in my previous application to provide a rectangular chamber adapted to receive a suitable number of vertically disposed screens 12 arranged in slide-ways; the screws being arranged in predetermined spaced relation as shown.

The cover or top 13 is adapted to provide a firm Huid-tight closure and may be raised and lowered by the mechanism shown, which is described and claimed in my pending application heretofore referred to, so that detailed description need not here be entered into.

The screens 12 terminate a short distance beneath'the top 13 as shown in Figure 1 to receive the upper portion of the bags 14. These bags are provided at top with a closure or top wall 15 of suitable fabric, such as duck or canvas, of which the bags are made; the top wall 15 at its perimeter being shown preferably enfolded or overlapped by the sides of the bag as shown at 16 in Figure 2 and the lapped portions and top 15 then securely stitched together so as to withstand the pressure and prevent the free fiow ofthe fluid through or at the seam. That is to say, the bags are so constructed that all of the introduced fluid, which is under a predetermined pressure, must percolate outwardly through the fabric. The top closure 15 is Acentrally shown provided with a pair of exible strips or washers 17, 17, preferably fue of leather, arranged on opposite sides of the closure or top 15; the two washers being firmly stitched or otherwise secured together and to the intervening top wall 15. The washers 17, 17 and the top wall or closure 15 are each provided with ahole which register with each other-as shown: aty18 to receive the nipple 19 secured to the A.manifold 20 of the filtering machine. As is apparent from Figure l, the manifold 20 is provided with a plurality of spaced nipples 19; each of which is to be provided with a bag as shown; and in order to effect a ti ht juncture between the bagsand nipples, t e nipples 19 may have .a slight taper, as shown in Figure 1; the holes in the washers being likewise also tapered so as to snugly fit onto the nipples.

Thetop of the bag'is also shownprovided with `a resilient holding element shown preferablyfinfthe nature of an endless wire coil A'or spring 21, seeV Figure 5, which passes through the long pockets formed by looping ythe fabricas-shown at 22. In the particular exemplification, these loops 22 are made by takinglong strips of fabric and folding them rinto"`loop 'form (one'on each. longitudinal side fof-the bag) Aand stitching the marginal edges yat'the :lapped seam between the bag proper and its vtop closure wall 15, see Figure 2. rThese-loops 22 do notextend entirely around vtheftopofthe-bag in orderthat the coil spring '21 `may be exposed at opposite sides of the lbag-to permit expansion and proper manipulation.

'Each'outlet-tube' or nipple 19 of the filteringmachine is provided with an elongated 'plate 23 having an opening to receive the nipple; -the plate being provided on its perimeter with a shoulder, Ias shown at 24 which "normally extends beneath the encir- H'cling element 22 of the bag andl therefore prevents accidental removal.

It' will 4be understood, of course, that the v,plates 23 `are of length somewhat greater Lthanfthe -normalsize of the `encircling element 22, thus necessitating the encircling element to bedistended in order to have it pass yover the shoulder 24 in encircling relation vwiththe plate; the tension of the encircling 'lelement being such that 'the bags will be trmlyheld'inposition, as shown in Figures 1 and 4.

,"The :bag ata-short distance from the top 15 is divided zto provide the two bifurcations -0r"legs 25, 25 of length commensurate with the -size of lthe machine Vin which they are ',to y*be used. Thatis to say, the bags are of -lengthfto extend from the vplates 23 at the topto apoint nea-r the bottom of the inner compartment of the machine as shown in The v`lower ends of the bifurcations or legs stitched 4to the leg lportions to -form a secure seam or joint in order to prevent the free passage of the fluid therethrough. The bot toms 26, preferably are made and so secured in place that when the bag is unfilled the bottoms will fold .up into the legs as shown in Figure 2. In providing the bifurcations or legs with the bottoms 26 as shown it is apparent that the bag may have greater capacity ,at the same time the bottom will permit percolation of the fluid therethrough.

It is essential in bags intended for filtering purposes, that proper access be had to the interior thereof for the purpose of cleaning; while at the same time preventing the passage of gasoline except that which percolates through the bag. In order to permit such access to the bag interior the crotch or junc ture between the bifurcations or legs 25, is slit as shown at 27, see Figure 6, extending transversely of the bag; the material at the slit being preferably folded about a cord as shown at 28 in Figure 3 and stitched thereabout as shown at 29 so as to provide a beaded edge or corded seam which is adapted to receive the clamping element 30. This clamping element is in the nature of a split tube, of length slightly greater than the length of the slit 27.

The tube 30 is preferably of more or less resilient sheet metal to permit slight lateral' distention; and is intended to be inserted endwise over the corded seams arranged about the slit 27, with the enlarged or corded portions 28, 28 arranged within the tube 30; it being understood, of course, that the longitudinal slot in the tube is just sufficient to permit the passage of the material adjacent to the corded seam therethrough. Then the split tube 30 is in place, the material at the crotch or juncture of the legs will be irmlv clamped together as shown in Figures 2 and '3 and passage of `gasoline or other iuid through the slit prevented.

When it is desired to clean the bag, the tube 30 is slipped off longitudinally from the corded seam, permitting easy access to the bag interior, as the bag may then be turned inside-out for proper cleaning.

It is apparent that a bag, iiuid tight so far as seams or junctures are concerned, is

provided, with simple means which may be easily put into place and also removed to enable proper access to the bag interior to be had; the method of application of the clamping means being clearly shown in Figure 6 where one leg or bifurcation 25 of the bag is shown raised, partly broken away, and the clamp partially removed to disclose the s it.

In practice, the gasoline or other liquid to `be filtered is introduced by means of a suitable pump through conduit 31 into the manifold 20 and thence by means of the respective nipples 19 into all of the filter bags 14; the various bags being filled with `the gasoline under pressure, causing the sides of the bifurcations of the bags to come into close relation With the screens l2. When it is desired to remove and clean the bags, the operator, after raising` the top of the tank, grasps the exposed portions ofl the resilient encircling elements 2l and distends the same sulliciently to permit said elements to clear or slide over the shoulders 24 of the plates 23. With my improved bags an increased filtering area is provided and quicker operation obtained; it being essential, in order to obtain proper filtration, to keep the bifurcations or respective bag portions in spaced relation by an intervening screen to allow the filtered gasoline or other fluid to trickle down over the mesh of the screen to the bottom of the tank.

lVhile l have shown and described what l believe to be the best form of my improved filtering bag and its holding` and clamping elements, modifications in certain details may be made Without, however, departing from the spirit of my invention.

What I claim is:

l. A filter bag bifurcated beneath the upper end, the upper end being provided With a closure or top having a fluid introducing opening therein, a continuous resilient element secured to the upper end of the bag, the bag at the juncture of said bifurcations being slit transversely, and clamping means for said slit portion.

2. A filter bag composed of fabric adapted to permit fluid to percolate therethrough, the bag being provided with a top immovably secured thereto, said top being provided with a fluid introducing opening, flexible Washers secured about said opening, the upper end of the bag being provided on opposite sides With looped bands, and an encircling distensible elementdisposed through said looped bands.

3. A filter bag of the character described bifurcated beneath the upper end thereof, each bifurcation being of the same Width as the bag, the crotch or juncture between the bifurcations being provided with an opening extending transversely of' the bag, and a clamping element adapted to be slid length- Wise over said opening.

e. A filter bag of the character described composed of textile material to permit percolation of liquid therethrough, the bag being provided with a closed top having a fluid introducing opening and at a distance reioved from the upper end being bifurcated, said bifurcations being provided With closed bottoms, the juncture between the bifurcations being open and havin@ an enlarged seam about said opening, and a split tube element adapted to be slid lengthwise over said opening with the enlarged seams located therein.

5. A filter bag composed of fabric adapted to permit fluid to percolate therethrough, the bag beneath the top being bifurcated, With the juncture between the bifurcations left open, and clamping means whereby the material at said opening is held against passage of fluid.

6. A filter bag composed of fabric adapted to permit fluid to percolate therethrough, the bag being bifurcated and provided With a transverse opening at the juncture of the bifurcations, the material about said opening being provided with an enlarged seam, and a split tube of resilient material insertible endvvise onto the enlarged seam about said opening.

7. A filter bag composed of fabric adapted to permit fluid to percolate therethrough, the opening to the bag being surrounded by a corded or enlarged seam, and a split tube of' resilient material adapted to be inserted endwise onto said seam to close said opening.

FREDERICK OLSON. 

